Mauritania became an independent nation on Nov. 28, 1960, and was admitted to the United Nations in 1961 over the strenuous opposition of Morocco, which claimed the territory. In the late 1960s, the government sought to make Arab culture dominant. Racial and ethnic tension between Moors, Arabs, Berbers, and blacks was widespread.

Mauritania and Morocco divided the territory of Spanish Sahara (later called Western Sahara) between them after the Spanish departed in 1975, with Mauritania controlling the southern third. The Polisario Front, indigenous Saharawi rebels, fought for the territory against both Mauritania and Morocco. Increased military spending and rising casualties in the region helped bring down the civilian government of Ould Daddah in 1978. A succession of military rulers followed. In 1979, Mauritania withdrew from Western Sahara.